all these are pretty good tracks, and all within 100 miles of my house in Nottinghamshire, East Midlands. (well.. one's 113, but meh)
Prices range from around £99 to £160 for most days depending on format (open pit or sessions), time of year, club discounts etc.
Hard to say what are the "top 10", as it's a lot to do with your driving ability / trackday experience and what you want to achieve; driving quickly / challenge your skills / drive a historic track / etc.
Ok, now I'm really jealous. eleven tracks within 100 miles. I think I have one, yes one and it's only available once in a while.
I have friends in Corby and now I'm pissed at them too 'coz I didn't know thay had a track right there. They took me to Rockingham Castle and the British Steel plant but never mentioned a track nearby. Ah, it probably wasn't built yet, but I'm still po'd ....
you lucky sods, I'm gonna go cry in my coffee now.